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"Fining agents are used on a lot-by-lot basis to optimize the quality. Some fining agents contain proteinaceous materials. Proteinaceous fining agents are used to react with color and/or tannin molecules to make them removable by subsequent filtration. Both the fining agent, the color and/or tannin it reacts with are removed by the filtration process. All of our fining agents are approved by the Alcohol & Tobacco Tax & Trade Bureau (TTB, formerly the Bureau of Alcohol, Tobacco and Firearms). One of our standard fining agents contains Micronized potassium casseinate [casein is milk protein], food grade gelatin, egg albumin and other food grade components."